Single-molecule imaging analysis of Ras activation in living cells

Hideji Murakoshi, Ryota Iino, Takeshi Kobayashi, Takahiro Fujiwara, Chika Ohshima, Akihiko Yoshimura, Akihiro Kusumi

研究成果: Article査読

279 被引用数 (Scopus)


A single-molecule fluorescence resonance energy transfer (FRET) method has been developed to observe the activation of the small G protein Ras at the level of individual molecules. KB cells expressing H- or K-Ras fused with YFP (donor) were microinjected with the fluorescent GTP analogue BodipyTR-GTP (acceptor), and the epidermal growth factor-induced binding of BodipyTR-GTP to YFP-(H or K)-Ras was monitored by single-molecule FRET. On activation, Ras diffusion was greatly suppressed/immobilized, suggesting the formation of large, activated Ras-signaling complexes. These complexes may work as platforms for transducing the Ras signal to effector molecules, further suggesting that Ras signal transduction requires more than simple collisions with effector molecules. GAP334-GFP recruited to the membrane was also stationary, suggesting its binding to the signaling complex. The single-molecules FRET method developed here provides a powerful technique to study the signal-transduction mechanisms of various G proteins.

ジャーナルProceedings of the National Academy of Sciences of the United States of America
出版ステータスPublished - 2004 5 11

ASJC Scopus subject areas

  • General

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